DENVER — The largest natural earthquake in Colorado in more than a century struck Monday night in the state’s southeast corner, but there had been no reports of damage or injuries.
The quake, with a preliminary magnitude of 5.3 and centered about nine miles from the city of Trinidad, hit at 11:46 p.m. local time. It was felt as far away as Greeley, about 350 miles north, and into Kansas and New Mexico, said Julie Dutton, a geophysicist at the National Earthquake Information Center in Golden, Colo.
Colorado, with its mix of mountains and plains, sits astride a seismically stable part of the nation where earthquakes are mostly mild and far between. But the area around Trinidad is regularly hit by tiny quakes as a result of a local fault zone, Ms. Dutton said.
http://www.nytimes.com/2011/08/24/us/24earthquake.html